D.Epithets
No, that is a descriptive adjective. An oxymoron would be two things that contradict each other such as "clean dirt" or dumb Asians.
The roses just come in a variety, and red is the most romantic of colors. If you want the most vibrant bunch, visit sites such as Rose Source.
A red rose is red because of the glucose in it.
They can be, they are the most colourfull of all rose types. A rose named Drop Dead Red is a good example along with Europeana
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